Oscillations of Evershed velocities and asymmetries

Details Oscillations of Evershed velocities and asymmetries Oscillations of Evershed velocities and asymmetries

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..243b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 1, Oct. 1990, p. 243-246.

Astronomy and Astrophysics

Astrophysics

5

Line Spectra, Penumbras, Solar Oscillations, Sunspots, Computer Techniques, Fine Structure, Temporal Distribution, Velocity Distribution

Scientific paper

Four sunspots at different heliocentric angles have been observed to study the oscillatory behavior of line asymmetries and velocities due to the Evershed effect. For two spots the power maxima of the line core velocities and of the line asymmetries are spatially anticorrelated. The central part of the penumbra as intersected by the spectrograph slit is the location of a velocity power maximum for the one spot, however, of an asymmetry power maximum for the other spot. In contrast, for two other spots several local power maxima are spatially coincident for the line asymmetry and the line core velocity. These variable spatial relations of line core velocities and line asymmetries support the idea that the Evershed effect may be a result of the superposition of penumbral fine structures affected by the underlying oscillating layers.

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